Answer:
A. NO₃⁻ ⇒ +5
B. NO₄⁺ ⇒ +9
C. N₂ ⇒ 0
D. NH₂OH ⇒ -1
E. NO₂⁻ ⇒ +3
Explanation:
To calculate the oxidation number of an element in a compound, we have to know the oxidation number of the other elements. Then, we have to consider that the sum of the oxidation number of each atom multiplied by the subscripts is equal to the net charge of the compound.
A. NO₃⁻
This is the ion nitrate. Oxygen atoms (O) has an oxidation number of -2 because it derives from an oxide. In this case, the net charge of the ion is -1. Thus, we calculate the oxidation number of N as follows:
N + (3 x (-2)) = -1
N - 6 = -1 ⇒ N= -1 + 6 = +5
B. NO₄⁺
In this case, the sum of the oxidation numbers of O and N multiplied by the subscripts is equal to +1:
N + (4 x (-2)) = +1
N - 8 = +1 ⇒ N = +1 +8 = +9
C. N₂
The oxidation number of N is 0 because N₂ is an elemental substance.
D. NH₂OH
The oxidation number of H is +1 and -2 for O. The net charge of the molecule is 0.
N + (H x 3) + (O) = 0
N + (+1 x 3) + (-2) = 0
N + 3 -2 = 0 ⇒ N = 2 - 3 = -1
E. NO₂⁻
The net charge of the ion nitrite is -1.
N + (2 x O) = -1
N + (2 x (-2)) = -1 ⇒ N = -1 + 4 = +3
Therefore:
Highest oxidation number = B. NO₄⁺ (+9)
Lowest oxidation number = D. NH₂OH (-1)
Name two elements, compounds and mixtures that are essential for living organisms. Also write why are they essential?
elements:
calcium : for strong bones
Iron : maintaining haemoglobin for metabolism
compunds
sodium chloride : to maintain blood pressure and other life processes
Adenosine Triphosphate: for metabolism, to maintain rate of inhalation and exhalation of oxygen and to supply energy
Mixture:
I) gasoline : used as fuel
ii) cement : used in construction
Answer:
Elements-
Oxygen is essential for living organisms to survive. Carbon dioxide is essential for the survival, growth and reproduction of living things. Plants obtain carbon from the atmosphere in the form of carbon dioxide, which they need for photosynthesis. They convert inorganic carbon into organic carbon in the form of sugar and starch, which they add to their tissues.Compounds-
Water is essential for living organisms to stay hydrated.Carbohydrate and protein- These compound are used to form new cells and tissues and to repair.Mixtures-
Blood is very much important for the transportation of oxygen in living organisms.Blood plasma is an example of a homogeneous mixture. This is a colourless fluid that holds the blood cells in suspension. It makes up a little more than half of the volume of human blood.someone please help!!
2 C4H10 + 13 O2 --> 8 CO2 + 10 H2O
Starting with 83.42 grams of Oxygen gas in excess C4H10, how much Carbon Dioxide can be created?
Box 1 = number
Box 2 = units
Box 3 = substance
Answer:
BOX 2
Explanation:
In the combustion reaction CH4+2O2 yield CO2 + 2H2Owhich reactant has the greatest rate of disappearance?
Answer:
To consume the 2.8 moles of CH4 we need 5.6 moles of O2 since the molar ratio is 1:2. We have only 3 moles of O2 ; therefore, O2 is the limiting reactant.
Explanation:
The reaction that has the greatest rate of disappearance is to be considered as the oxygen.
The Reactant that has the greatest rate of disappearance:Since the chemical equation is
CH4(g) + 2 O2(g) ---------------- CO2(g) + 2H2O(g)
For consuming the 2.8 moles of CH4 we needed the 5.6 moles of oxygen as the molar ratio is 1:2
Also, As per stoichiometry, Oxygen disappears with twice the rate as compared to Methane.
Learn more about reactant here: https://brainly.com/question/26122702
20. A compound's empirical formula is C,H,O. If the molecular mass of the compound is
162.2g, what is the molecular formula?
SECOND TIME POSTING NO LINKS PLEASE:)!
Answer:
Just use a text book.. So that you get the concept
find out the, mass of 10^21 molecules of cu
Answer:
0.105 g
Explanation:
Since 1 Mole is 6.022 x 10^23 molecules. i.e 1.66 x 10^(-2) moles. = 0.105 Grams.
if a body travel 60m on a straight line in 20 seconds. Find its velocity.
Answer:
v = distance/time = 60m/20s = 3 m/s
Which number represents the water table?
1
2
3
4
Answer:
2
Explanation:
the level below which the ground is saturated with water.
2
What is the water table zone?
The water table zone is right on the top of the saturated zone, and it's below the land surface. The depth of the water table variates going from near the surface or hundreds of meters below the land surface
Water Table Examples:
Aquifers. Three examples of water table aquifers are the Ogallala aquifer in the United States of America, the Great Artesian Basin in Australia, and the Lotikipi Basin Aquifer in KenyaLearn more about Water Table here
https://brainly.com/question/2477873
#SPJ2
In the figure above, name the compound in diagram C.
a. 3-ethylpentane
b. 3-isoheptane
c. 3-methylpentane
d. diethylpentane
Answer:
C. a. 3-ethylpentane is a required answer
3-ethylpentane is the name of compound in diagram C. Therefore, the correct option is A.
An organic compound that belongs to the alkane family is 3-ethylpentane. It has an ethyl group [tex](-C_2H_5)[/tex] attached to the third carbon atom and is made up of a chain of five carbon atoms (pentane). 2,2-dimethylbutane is the formal IUPAC designation for 3-ethylpentane.
3-Ethylpentane is an alkane that demonstrates the typical properties of this group of substances. It is a saturated hydrocarbon, which means that there are only single bonds between the carbon atoms in it, making it a relatively inert substance. Alkanes are frequently present in petroleum and natural gas, and because to their characteristics, they form good fuels.
Therefore, the correct option is A.
Learn more about alkane, here:
https://brainly.com/question/19465365
#SPJ2
What are the units of the rate constant for each of the reactions in Table 12.2?
Rate Law
Rate = k [(CH₃ )₃ CBr]
Rate = k [Br₂]
Rate = K[ BrO₃⁻ ][Br⁻] [H⁺]²
Rate = k [ H₂][I₂]
The first reaction is a first order reaction and the unit of rate constant is s⁻¹. The second one is also a first order reaction with the same unit. Third one is a third order reaction with the unit for k as L² mol⁻² s⁻¹.
What is rate constant?Rate of a reaction is the rate of decrease in concentration of the reactants or increase in concentration of the products. The rate is directly proportional to the concentration of reactants and the rate law is written as:
rate = k [reactants]
where, the proportionality constant k is called the rate constant.
The order of a reaction is the sum of powers of the molar concentration of reactants. Thus, each reaction vary in order and the order of reaction also depends on the steps in the reaction.
The general formula of the unit of rate constant is L⁽ⁿ⁻¹⁾ mol⁽¹⁻ⁿ⁾ s⁻¹. Hence, first reaction is a first order reaction and the unit of rate constant is s⁻¹. The second one is also a first order reaction with the same unit.
Third one is a third order reaction with the unit for k as L² mol⁻² s⁻¹. The fourth one is a second order reaction. Thus, unit of rate constant is L mol⁻¹ s⁻¹.
Find more on rate constant:
https://brainly.com/question/20305922
#SPJ1
Water vapor _____.
keeps the Earth cool
exists mainly over the poles
traps heat and keeps the Earth warm
is a trace gas
Answer:
traps heat and keeps the Earth warm.
Which of the following factors affects the amount of heat absorbed by a substance? (5 points) a. Shape of the substance b. Melting point of the substance Selected: c. Boiling point of the substanceThis answer is incorrect. d. Specific heat capacity of the substance
Answer:
d. Specific heat capacity of the substance
The factors affects the amount of heat absorbed by a substance is the specific heat capacity of the substance. Therefore, option D is correct.
What is specific heat capacity?The specific heat capacity of a substance, also known as the mass heat capacity, is the heat capacity of a sample of the substance divided by the mass of the sample.
When heated with constant heat input, a substance's temperature curve will be flatter the higher its specific heat capacity.
The heat capacity per unit mass of a substance, often known as the specific heat capacity. Experiments demonstrate that three things affect the transmitted heat: (1) The change in temperature, (2) the system's mass, (3) the substance's kind and phase, and (4) the system's composition.
Thus, option D is correct.
To learn more about the specific heat capacity, follow the link:
https://brainly.com/question/1747943
#SPJ3
A sample of 4.0 L of nitrogen, at 1.2 atmospheres, is transferred to a 12 L container.
What will the pressure be in the new container?
(please show work)
Answer:
0.40 atm
Explanation:
P1V1 = P2V2
(1.2)(4.0) = P2(12)
P2 = 0.40 atm
Which of the following statements is/are incorrect regarding dilution of concentrated sulphuric acid?
Answer:
Option d) 3 only is the right answer
How is thermal energy transferred during conduction? Check all that apply.
1.Thermal energy is transferred between particles that are not touching each other.
2.Thermal energy is transferred between particles that are in direct contact with each other.
3.Thermal energy is transferred between objects of different temperatures.
4.Thermal energy is transferred between objects of the same temperature.
5.Thermal energy is transferred from slow-moving particles to fast-moving particles.
6.Thermal energy is transferred from fast-moving particles to slow-moving particles.
Answer:
Thermal energy is transferred between particles that are in direct contact with each other.
Thermal energy is transferred between objects of different temperatures.
Thermal energy is transferred from fast-moving particles to slow-moving particles.
Explanation:
A city along the coast of the Atlantic Ocean experiences a seasonal high of 76°F in the summer. The city experiences a seasonal low of 23°F in the winter.
Another city is 60 miles inland and at the same latitude and elevation. This city will probably experience _______ summer highs and _______ winter lows.
Answer:
Warmer and cooler
Explanation:
The city which is along the coast of the Atlantic Ocean may experience a seasonal high of 76°F in summer. The city also has a seasonal low of 23°F in the winter. Another city is 60 miles inland and at the same latitude and elevation, this means that the city has cool winter lows and a warmer supper high.Answer:
warmer and cooler i just did it on study island
Explanation:
18-38 Name the following ketones and aldehydes. When possible, give both a common name and an IUPAC name.
(a) CH₃CO(CH₂) ₄CH₃
(b) CH₃(CH₂)₂CO(CH₂)₂CH₃
(c) CH₃(CH₂)CHO₅
(d) PhCOPh
(e) CH₃CH₂CH₂O
(f) CH₃COCH₃
(g) CH₃CH₂CHBrCH₂CH(CH₃)CHO
(h) Ph --- CH = CH ----CHO
(i) CH₃CH= CH---CH = CH --CHO
The IUPAC name of the following organic compounds are,a) hept-2-one b) hept-4-one c) heptanal d) diphenylmethanone e) propan-1-one f) acetone g) 3-bromo-1-hexanal h) 3-phenylprop-2-enal i) 2,4-hexdiene-1-al.
What is a compound?Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
Learn more about compound,here:
https://brainly.com/question/13516179
#SPJ1
Sep Obtain Information What are the Limitations to Making Progress with Engineering Better Batteries ? What progress have Battery Engineers Made?
Limitations in making progress with Engineering Better Batteries is that electric vehicles are being prevented to make progress in terms of size and range , progress which is made is solid state batteries.
What are solid state batteries?
A solid-state battery is a battery technology that uses solid electrodes and a solid electrolyte, instead of the liquid or polymer gel electrolytes which are found in lithium-ion or lithium polymer batteries.
While solid electrolytes were first discovered in the 19th century, several drawbacks have prevented it's widespread application. Developments in the late 20th and early 21st century have caused renewed interest in solid-state battery technologies, especially in the context of electric vehicles, starting in the 2010s.
Solid-state batteries can provide potential solutions for many problems of liquid Li-ion batteries, such as flammability, limited voltage, unstable solid-electrolyte interphase formation, poor cycling performance and strength.
Learn more about solid state batteries,here:
https://brainly.com/question/17683368
#SPJ1
Ca(OH)2 + 2HNO3 → Ca(NO3)2 + 2H2O
Answer: You have it right
Explanation:
you put the two on the H2O to make it 2H2O and A two on the HNO3 to make it 2HN03 To make it balanced, good job
Use Target Reading Skills After you read the section, reread the paragraphs that contain definitions of Key Terms. Use all of the information you have learned to write a meaningful sentence using each Key Term. a. chemical equation:
An electromagnet can be made by wrapping wire around which object?
Answer: A wire the first answer gl on the quiz
A solution containing 3.39 mM X (analyte) and 1.72 mM S (internal standard) gave peak areas of 3497 and 9997, respectively, in a chromatographic analysis. Then 1.00 mL of 8.47 mM S was added to 5.00 mL of unknown X, and the mixture was diluted to 10.0 mL. This solution gave peak areas of 5428 and 4431 for X and S, respectively.
a. Calculate the response factor for the analyte. (keep four significant figures)
b. Find the concentration (mM) of X in the original unknown
c. Find the concentration (mM) of X in the 10.0 mL of mixed solution.
Answer:
a. Response factor is 0.1775
b. 11.7mM of X in the original unknown
c. 5.85mM is the concentration of X in the diluted solution
Explanation:
a. The equation to find response factor is:
F = AreaX*[S] / AreaS*[X]
Where Area of X our sample and S the internal standard whereas [] represent the concentration of each one.
Replacing:
F = 3497*1.72mM / 9997*3.39mM
F = 0.1775
c. The concentration of S is:
8.47mM * 1.00mL / 10.0mL = 0.847mM
Replacing:
0.1775 = 5428*0.847mM / 4431*[X]
[X] = 5.85mM is the concentration of X in the diluted solution
b. The concentration of X in the original unknown is:
5.85mM * (10.0mL / 5.00mL) =
11.7mM of X in the original unknown
15 PTS PLEASE HELP QUICK
(not related to the question but please add me thx i want friends)
OK THX THE QUESTION IS BELOW
A molecule or ion that donates the hydrogen in a hydrogen bond is a hydrogen bond donor.
a. True
b. False
Answer: The statement 'a molecule or ion that donates the hydrogen in a hydrogen bond is a hydrogen bond donor' is true.
Explanation:
A molecule or ion that donates hydrogen in a hydrogen bond is called a hydrogen donor.
For example, [tex]NH_{3} + H_{2}O \rightarrow NH^{+}_{4} + OH^{-}[/tex]
Here, [tex]NH_{3}[/tex] is donating the hydrogen ion to water molecule. Whereas water is accepting the hydrogen ion so water is a hydrogen bond acceptor. Therefore, hydrogen bond is formed by [tex]NH_{3}[/tex].
Thus, we can conclude that the statement 'a molecule or ion that donates the hydrogen in a hydrogen bond is a hydrogen bond donor' is true.
What is the number of chloride ions (Cl-) in 250 mL of a 0.2M magnesium chloride solution?
a. 0.1 mol c. 0.62 mol
b. 0.16 mol d. 1.6 mol
According to molar concentration and mole concept, there are 0.1 mole of chloride ions in 250 mL of a 0.2 M magnesium chloride solution.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.
By substituting values in given formula, number of moles=0.2×0.250=0.05 moles .Now this values is subtracted from molar mass of magnesium chloride that is 95.211-0.05=95.161 moles which is finally divided by 95.211=0.999 which is approximately 0.10 mole.
Learn more about molar concentration,here:
https://brainly.com/question/21841645
#SPJ1
How many bromine are in 6NaBr?
Explain the steps that were taken to get to the answer
Atoms are bonded together in a different order in
a. organic compounds.
b. structural isomers.
c. geometric isomers.
d. three-dimensional models.
Answer:
answer.A
Explanation:
that is my answer
1.5 billion plastic bottles are bought world-wide each day. These bottles are about 9.8 inches in length (1 meter = 3.28 ft). If the Earth's diameter is about 40,000 km at the equator, how many times could you encircle the Earth with the bottles laid end to end?
Hint: Your DA table should have 5 conversion factors
The number of times 1.5 billion plastic bottles laid end to end could encircle the Earth would be 9.34 times.
Dimensional analysisSize of bottle = 9.8 inches
1 foot = 12 inches
Size of 9.8 inches bottles in foot = 0.8167 ft
Also, 3.28 ft = 1 meter
0.8167 ft = 0.8167x1/3.28
= 0.2490 meter
1000 meter = 1 km
0.2490 meter = 0.2490/1000
= 0.000249 km
Total number of bottles = 1.5 billion
Total length of 1.5 billion bottles laid end to end in kilometers = 1,500,000,000 x 0.000249 = 373,500 km
Number of times the bottle could encircle the earth = 373,500/40000
= 9.34 times
Thus, 1.5 billion plastic bottles would encircle the Earth about 9.34 times if laid end to end.
More on dimensional analysis can be found here: https://brainly.com/question/13078117
#SPJ1
What is the concentration of a solution with a volume of 1 L that contain 200 grams of Fe(OH)3?
Brainliest will be given
Answer:
0.187M
Explanation:
Which of these is an example of a physical property?
A. Potassium ignites when placed in water.
B. Iron melts at 1,535 °C.
C. Hydrogen combines with oxygen to form water.
D. Chlorine oxidizes bacterial cells.
Answer: B is correct.
Explanation:
Answer A is a chemical change because of intense changes of color and expansion.
Answer C is a chemical change, as hydrogen and water are chemically bonding together.
Answer D is a chemical change because oxidation involves loss of electrons during a chemical reaction.
On the other hand, melting is a physical change. Therefore, answer B is the correct answer.